.'i. .STKRNOPrGTJS. 7 



3. STERNOPYGUS*. 



Stemopygus, Mull. Sf Trosch. Ilor. Ichthyol. iii. p. 13. 



Caudal fiii none ; no trace of a dorsal fin. Both jaws with a patch 

 or band of small villiform teeth ; a patch of minute teeth on each 

 side of the palate. Anterior nostrils on the upperside of the head. 

 Snout short or of moderate length ; vent behind the orbit. 



Tropical America. 



1 . Sternopygus carapus. 



Seba, iii. tab. 32. figs. 3-4. 



Gymnotus, sp., Gronov. Zoophyl. no. 1G8 ; Mus. Ichth. i. p. 29. 



no. 72. 

 Gymnotus carapo, L. Syst. Nat. i. p. 427 j Block, v. p. 59, tab. 157. 



tig. 2 ; Gronov. Syst. ed. Gray, p. 22. 



niacrurus, Bl. Schn. p. 522. 



Carapus macrourus, Cuv. R'cyiie An. 



Stemopygus niacrurus, Mull. ^ Trosch. I. c. p. 14 ; Kaup, Apod. 



p. 137 ; Steindachner, Sitzysber. Ak. Wiss. Wten, 18G8, Iviii. 



p.' 259. 

 Carapus arenatus, JEyd. t^ Soid. Voy. Bonite, Zool. i. p. 210, pi. 8. 



fig. 2. 

 sanguinolentus, Casteln. An. Am. Sud, Poiss. p. 85, pi. 46. 



fig. 1. 

 Sternopj'gus marcgi-avii, Eeinh. Vidensk. Meddel. naturh. Foren. 



Kjobenh. 1852 (1853) : or Wiegm. Arch. 1854, p. 180. 



Orbit with a free circular margin. Eye small, about one-fourth 

 of the length of the snout. Mouth of moderate width. Unifonn 

 brown or black, a black blotch above the gill-opening ; sometimes 

 mottled with darker. Young examples sometimes with a yellow 

 band along the side of the tail. 



Tropical America. 



a. Half-grown. Essequibo. Collected by Hr. Ehrhardt. 



h, c-d. Adult (24 inches) and young. Surinam. Collected by Hr. 



Kappler. 

 (jfig-^- Half-grown and young. Surinam. From the Collection of 



H. van Lidth de Jeude. 

 i-k. Adult and young : skins. Prom Gronow's Collection. 

 I, m-o. Adult and half-grown. Para. 

 2). Half-grown. Rio das Velhas. Presented by Prof. Reiii lardt. — 



One of the typea of St. marcgravii. 



2. Stemopygus virescens. 



Stemarchus virescens, Valenc. . in If Orb. Voy. Amer. Merid. Poiss. 



pi. 13. fig. 2. 

 Sternopygus tumifrons, Midi. Sf Trosch, Hor. Ichthyol. iii. p. 14. 

 lineatus, Mull. 8f Irosch. I. c. ; Kaup, Apod. p. 138 ; Stettt- 



dachner, I. c. p. 261. 



* 1. Gymnotus requilabiatus, Humboldt, Observ. Zool. i. p. 46, pi. 10 ; Kaup, 

 Apod. p. 142. — River Magdalena, New Granada. 



